Rock-crusher.



. c. T. HUTGHINSON.

' Patented Feb. 25, 1913.

lulllll I UNITED STATES PATENT OFFICE.

CHARLES T. HUTCI-IINSON, OF OAKLAND. CALIFORNIA, ASSIGNOR TO JOSHUAJHENDRY IRON WORKS, OF SAN FRANCISCO, CALIFORNIA, A CORPORATION OFCALIFORNIA.

R'OCK-CRUSI-IER.

Specification of Letters Patent.

Patented Feb. 25, 1913.

Application filed June a, 1911. Serial no 632,078.

To all whom, it may concern:

Be it known that I, CHARLES T. Hu'rcnmson, citizen of the United States,residing at Oakland, in the county of Alameda and State of California,have invented new and useful Improvements in Rock-Crushers, of which thefollowing is a specification.

This invention relates to a rock crusher of the oscillating aw type andparticularly pertains to the construction of the shoe and die therein.

It is the object of this invention to provide sectional shoes and diesfor rock crushers of the jaw type, which are interchangeable andinterlocking and which are designed to obviate one of the most seriousobjections heretofore found in jaw type crushers, viz: the

waste of material caused by the cupping or unequal wearing of thecrushing faces, and

the necessity of replacing the worn portions 3y the installationofentirely new shoes and res.

In the ordinary type of jaw crusher in which the shoe and the die eachconsist of a one-piece crushing plate, these plates become worn greatestin their middle, adjacent their ends, and not throughout the entirewidth. The shoe and die thus worn may be set up until they practicallytouch at the edges, and still be so badly worn or cupped that a piece ofrock much "too large for its purpose will be permitted to easily escapefurther crushing and thus destroy the usefulness of the breaker. \Vhenthis condition is reached the worn shoes and dies are discarded, and asthe average wear of shoes and dies is twenty-five per cent. of the totalweight when new, the balance of seventyfive per cent. becomes a wasteand is of no further value. Inasmuchas the shoes and dies are made ofthe hardest and most expensive steel the loss due to replacement andwaste is very great.

I purpose forming the crushing faces of the shoes and dies in sectionsand of such character that they are interchangeable so that the defectsarising from the use of single piece crushing faces are largelyobviated.

and a very considerable economy of time and money effected. Practicaltests and experiments have demonstrated that by constructing andarranging the shoe and die in accordance with this invention that atleast eighty-five per cent. of the weight. of the shoe and die can beused before replacements or renewals become necessary.

The invention consists of the'parts and the combination and constructionof parts as hereinafter more fully described and claimed havingreference to the accompanying drawings, in which- Figure 1 is a verticalsection of the invention. Fig. 2 is a perspective view of the die. Fig.3 is a perspective view of the shoe. Fig. 4 is a perspective view of theinter changeable sectional crushing plate. Fig. 5 is a perspective viewof the key locking crushing plate.

In the drawings A represents a stationary end'plate the face of'which isrecessed. as at 2. which recess is bordered by an inwardly extendingflange or lip 3 A swinging jaw is indicated at B. which jaw is mountedon and depends from shaft 4 and is-designed to be oscillated by andthrough a toggle 5 from any suitable source of power by means of anydesired mechanism, the jaw B being designed to have a rocking movementwith the shaft 4 as a pivot. The outer face of the jaw B is recessed asat 6, which recess is surrounded by an inwardly extending flange 7 Theessence of this invention resides in mounting a series of detachable andinterchangeable corrugated. or plain plates in the recesses 2-6"' on theend plate A and cated at 8 and the other at 9, and are respectivelyshown in detail in Figs. 4 and 5. The plates 8 and 9 are of equalthickness and are of corresponding width, and are so corrugated on theirouter faces that when placed end to end the corrugations will extendcontinuously the combined lengths of the plates. The sides of the plates8 and 9 are sloped or beveled in an outward direction, as are the endsof the plates 8', as shown in Fig. 4, while the ends of the plates 9 arebeveled inwardly, as shown in Fig. 5. The underside of each plate'9 isgrooved transversely with a dove-tailed groove 10 which is adapted to beengaged with a corresponding dovetailed projection 1111 formed ,on therecessed face of the end plate A'and jaw B,

as shown in Fig. 1.

for

In assembling the corrugated plates 8-9 n the end plate A and jaw B; apair of the plates 8 are placed in the recesses 2-6 at each *endthereof, with the tapered ends of the plates extending beneath theoverhanging flanges 3 -7. A pair of the central key arch plates 9 arethen placed in the space intervening between the inner ends of theplates.8, the plates 9 being inserted in a lateral direction so as to beengaged by the dove-tail 11. lVhen'thus positioned the outer ends of theplates 9 will over-hang the inner ends of the plates 8 and thus lock thelatter in position on the plate A and jaw B. As a means of furthersecuring the plates 8 and 9 in position countersunk-head bolts 12 arepassed through the plates 9 as shown in Fig. 1, and extending throughthe plate A and jaw B are secured by .nuts 13, the bolts 12 thus rigidlyclamping the plates .8 and 9 against movement.

From the foregoing it will be seen that when the outer ends and centralportions of the corrugated plates 8- become worn that they may bereversed and turned up side down so as to place the unworn portions inthe position of greatest wear.

sections are so fitted and dove-tailed together The several and may alsobe reversed as becomes necessary, and worn almost entirely to thesurface.

In actual practice I prefer to make the die sections substantiallytrapezoidal in form, with reversing end bevels to engage the central keyarch section so that it will coact with the under-cut ends 3-? of thejaw plates AB in holding all the sections together when engaged eitherby the dovetails 11-1l' or drawn up by the bolts 12.

Having thus describedmy invention, what I claim and desire to secure byLetters Patent is- 1. Ina rock crusher, a crushing member having a flatface with under-cut ends, a die section of trapezoidal form having oneof its beveled -edges fitting one of said undercut ends, anothertrapezoidal die section havinga beveled end fitting the oppositeunder-cut end and a trapezoidal key arch central die section interposedand interlocking with said upper and lower die sections, and meansco-acting with the central die section and'with said under-cut ends tohold all the die sections rigidly in place.

2. In a rock crusher, a crusher member having a flat face w1th under-cutends, die

sections of trapezoidal form having their edges beveled, a trapezoidalkey arch central die section interposed between and interlocking withsaid first mentioned die sections, and means co-acting with said centraldie section to hold said central die section in definite position, saidfirst mentioned 'die sections being interchangeable and reversible.

In testimony whereof I'have hereunto set my hand in the presence of twosubscribing Witnesses.

' CHARLES T. HUTCHINSON. Witnesses CHARLES EDELMAN, D. B. VALENTINE.

